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// **********************************************************************
//
// Copyright (c) 2003-2006 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
#include <IceGrid/Allocatable.h>
#include <IceGrid/SessionI.h>
using namespace std;
using namespace IceGrid;
AllocationRequest::~AllocationRequest()
{
}
bool
AllocationRequest::setAllocatable(const AllocatablePtr& allocatable)
{
Lock sync(*this);
assert(!_allocatable);
if(_canceled)
{
return false;
}
_allocatable = allocatable;
allocated(_allocatable);
return true;
}
void
AllocationRequest::cancel()
{
Lock sync(*this);
if(_canceled)
{
return;
}
_canceled = true;
canceled();
}
bool
AllocationRequest::checkTimeout(const IceUtil::Time& now)
{
assert(_timeout > 0);
{
Lock sync(*this);
if(_canceled)
{
return true;
}
_canceled = _expiration < now;
if(!_canceled)
{
return false;
}
timeout();
}
_session->removeAllocationRequest(this);
return true;
}
void
AllocationRequest::allocate()
{
_session->addAllocationRequest(this);
}
void
AllocationRequest::release(const SessionIPtr& session)
{
//
// Check if the session releasing the object is indeed the session
// which initiated the allocation request.
//
if(_session != session)
{
throw AllocationException("can't release object which is not allocated");
}
_session->removeAllocationRequest(this);
}
bool
AllocationRequest::operator<(const AllocationRequest& r) const
{
return this < &r;
}
AllocationRequest::AllocationRequest(const SessionIPtr& session) :
_session(session),
_timeout(_session->getAllocationTimeout()),
_expiration(_timeout > 0 ? (IceUtil::Time::now() + IceUtil::Time::milliSeconds(_timeout)) : IceUtil::Time()),
_canceled(false)
{
}
Allocatable::Allocatable(bool allocatable) : _allocatable(allocatable), _allocated(false)
{
}
Allocatable::~Allocatable()
{
}
void
Allocatable::allocate(const AllocationRequestPtr& request, bool allocateOnce)
{
IceUtil::Mutex::Lock sync(_allocateMutex);
if(_allocatable)
{
if(_allocated)
{
if(_allocated->getSession() == request->getSession())
{
if(allocateOnce)
{
throw AllocationException("object already allocated by the session");
}
request->setAllocatable(this);
}
else if(request->getTimeout())
{
request->allocate();
_requests.push_back(request); // TODO: XXX: monitor request timeout if timeout != -1
}
else
{
request->timeout();
}
}
else if(request->setAllocatable(this))
{
_allocated = request;
_allocated->allocate();
}
}
else
{
if(allocateOnce)
{
throw AllocationException("can't allocate non allocatable object");
}
bool rc = request->setAllocatable(this);
assert(rc);
}
}
bool
Allocatable::tryAllocate(const AllocationRequestPtr& request)
{
IceUtil::Mutex::Lock sync(_allocateMutex);
if(_allocatable && _allocated)
{
return false;
}
else if(request->setAllocatable(this))
{
_allocated = request;
_allocated->allocate();
}
return true;
}
void
Allocatable::release(const SessionIPtr& session)
{
IceUtil::Mutex::Lock sync(_allocateMutex);
if(!_allocated)
{
throw AllocationException("object not allocated");
}
_allocated->release(session);
while(!_requests.empty())
{
_allocated = _requests.front();
_requests.pop_front();
if(_allocated->setAllocatable(this))
{
return;
}
}
_allocated = 0;
}
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